Features 1. Wide Range Of Applications: The EMF meter helps to measure electromagnetic fields, identify equipment that generates high radiation, and enable users to make decisions to limit exposure. Mainly used for testing televisions, computers, printers, microwaves, refrigerators, cellular towers, low-frequency appliances, etc. 2. 5 LED Indicator Lights: Easy to read multi-segment LED display screen. This electromotive force detector has 5 LED indicator lights that can be read during the day or in the dark, making it easy to carry around as it can be placed in a pocket or wallet. 3. No Charging Required: The detector operates on a single battery and reports EMF measurement results within a range of 5 milligauss. When the battery runs out, it needs to be replaced. This EMF detector does not support charging. Use a screwdriver to unscrew the plastic cover, remove the old battery, insert a new battery, and tighten the cover again with a screwdriver. 4. Accurate Measurement: Measures various EMFs from 50 Hz to 20000 Hz, and registers a phone within 2 feet. 5. Protect Your Health: Measure electromagnetic field levels to prevent long-term overexposure to electromagnetic fields that may be harmful. You can use this electromagnetic field detector at home, office, etc. Specification 5-LED indicators, representing different radiation values 1 x 9V (including power supply) Application 50/60Hz frequency monitoring Dark green 0 1.5 milligauss; Green light ranging from 1.5 to 2.5 milligauss; Yellow 2.5 to 10 milligauss; Orange 10 to 20 milligauss; Red 20+ milligauss; Material: ABS Color: Black, White Size: 14.3 x 2.9 x 5.3 cm Weight: 100 g Package Include: 1x Host 1x Battery 1x English User Manual